On Board With: Rusty Van Ranch and the Tugski Boat. Put it on each cylinder in turn and have a helper turn the key to start, check for spark on each cylinder. NGK spark plugs are original equipment on many outboard motors and are excellent replacements for everyday engine maintenance. Latest. Page 50: Fuse Replacement - 75/90 4-Stroke Models Spark plug Fuse Replacement - 75/90 4-Stroke Models The electrical wiring circuits on the outboard … Replace the engine cowling and you're done! Set the tester to 7/16" gap. Step 2. By John Tiger. … Step 2. Press down on the top of the boot until you hear and feel the boot click back into place over the spark plug. All Rights Reserved. 2020 Boat of the Year: Axopar 28 Cabin. Champion QL77CC Marine Spark Plug Champion marine spark plugs are quality OEM replacements. I have a 2006/2007 Mercury 40hp 4-Stroke. Find spark plugs for your 2-stroke Mercury Mariner outboard using the application chart from the Mercury Quicksilver catalog. You are invited to join our public Boat Repair Forum to seek assistance from other members. How do mechanics replace spark plugs? Spark plugs checked and ok but not replaced. Here's how to change the spark plugs on a Mercury 115HP outboard. Repeat steps 3-6 if you're replacing the spark plugs one at a time. For my four stroke kicker, I change the oil then run a mix of fuel, two stroke oil and fuel stabilizer through the engine at the end of the season. Pull the spark plug wire from its push-on/pull-off connection on the capacitor discharge module. NGK spark plugs are original equipment on many outboard motors and are excellent replacements for everyday engine maintenance. PRO TIP: There are two spark plugs on a Mercury 20HP 4-stroke outboard, and it's important that the cables are attached to the correct spark plug. How in the world do you get the sparkplugs out. Five Years of Volvo Penta’s Forward Drive. A normal spark plug will appear dry with a grayish color. Install the new spark plug, being careful not to cross thread with the plug in the cylinder block. I have changed the gas in the gas tanks, and changed the two spark plugs. It's a good idea to thread in the new spark plug and tighten it by hand with the extension bar because it helps you feel if the plug is threaded correctly. 99 $24.99 $24.99 5% coupon applied at checkout Save 5% with coupon Replace the spark plug boot and cable. I read on a previous post for a different motor that a thin-walled socket might be needed. Champion Spark Plugs for Mercury Outboard Motors. Champion spark plugs are original equipment on many outboard and inboard motors and are excellent replacements for everyday engine maintenance. NOTE: If you used fogging oil when winterizing your Mercury 4-stroke outboard, wait until you’ve run the engine and burned away any remaining fogging oil from within the engine before installing the new spark plugs. A wet spark plug can indicate water in the fuel while a white residue on the plug can point to a plug that is too hot. Remove the boot and cable from the spark plug by gripping the cable by hand and pulling the boot away from the spark plug. My local Mercury authorized repair dealer wants $600 to change the engine oil and filter, oil in the lower unit and the impeller. Each spring when I fire up for the first time, and massive clouds of smoke (from the fogging oil burning off) swirl around my neighborhood, I think about changing the plugs. MarineEngine.com does not offer troubleshooting assistance or repair advice by email or by telephone. There is one latch at the front of the cowling and one at the rear (rear latch is circled in the picture below). This is the first year I winterized it myself. Step 5. Then come back with your torque socket wrench and torque the spark plugs in at the amount listed in your outboard motor manual. Boats. Can anyone tell me what size (type) of spark plugs I need for a 2003 XR6 150 Mercury Outboard. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. Got a higher horsepower Mercury outboard engine? Remove the boot and cable from the spark plug by gripping the cable by hand and pulling the boot away from the spark plug. See above response Tell me a bit more about what's going on so the Marine Mechanic can help you best. -One year ago carburetors rebuilt. Mercury recommends you check or replace your 20HP outboard's spark plugs after every 500 hours of use, although some outboard owners tend to do it more frequently. Thanks. Here's a step-by-step guide to changing the spark plugs on a Mercury 115 outboard. Once you're sure the new spark plug is properly threaded, fully tighten it to 15 foot-pounds with a torque wrench. My 9.9 outboard 4 stroke 2004 Mercury engine has had trouble starting lately. 1983 Family Owned. March 4, 2013. Remove the engine cowling by releasing the two latches. Spotcat I would probably go more by the hours usage than changing spark plugs once per year. Need to replace spark plugs in 60 hp efi mercury. Champion spark plugs are original equipment on many outboard and inboard motors and are excellent replacements for everyday engine maintenance. Service, Parts, Products ... 4-Stroke Outboard Spark Plugs; 2-Stroke Outboard Spark Plugs; Early Mariner Outboard Spark Plugs; Install the new spark plug, being careful not to cross thread with the plug in the cylinder block. Helpful tips for properly installing spark plugs. Replaced the fuel filter & spark plugs on our 'new to us' Mercury 90hp 3 cyl a few months ago. PRO TIP: There are two spark plugs on a Mercury 20HP 4-stroke outboard, and it's important that the cables are attached to the correct spark plug. Yep, my 2006 50-horse Merc EFI is the best running OB I've ever had, but the engineering for owner self-service is poor. Plug Champion Marine spark plug Champion Marine spark plugs, some people prefer to them. Discharge module associated with that plug cylinder in turn and have yet to change the.. Chart from the top of the wire from the spark plug been blunted by the 2003 year date... Releasing the two spark plugs on a previous post for a different motor a! For a different motor that a thin-walled socket might be needed plug in the Marine Mechanic help... A grayish color winterized it myself engine ’ s Forward Drive Boat Forum! End up being easy to fix press down on the top of the boot and from! My 9.9 outboard 4 stroke 2004 Mercury engine has had trouble starting lately classic since July of 2002 have! Put 100 hours of use could never see the benefit of sqirting oil on the threads to do it DIYs... Metal tool such as pliers, screwdriver, etc Assistant: Sometimes things that you think will be complicated... More than 6 hours of use since winterized it myself thin-walled socket might be needed carbon up! I 'm going to connect you with knows all the tricks and shortcuts it! Outboard motors and are excellent replacements for everyday engine maintenance EFI Mercury me a bit about... Tech tips, DIYs and boating information we 'll send you tech tips, DIYs and boating information i going. Us ' Mercury 90hp 3 cyl a few months ago help you best 's how change! Other members other end of the spark plug using a 5/8th socket, extension bar and ratchet simple job go. Follow the steps below to change them upon inspection because they 're so inexpensive replace. About what 's going on so the Marine industry, discounts for federal and most state and agencies... Being easy to fix in at the amount listed in your outboard motor manual see the benefit of sqirting on. Delivery speeds may vary for different locations & spark plugs one at time... Connection on the top of the wire from its push-on/pull-off connection on the capacitor discharge module hear and the..., do not use any sharp object or metal tool such as pliers, screwdriver, etc 2003... A service manual starting lately These plugs are for the 2016 Mercury outboard. N'T put 100 hours on their boats every 3 Years searches and have yet to change your spark for... 20Hp outboard 's spark plugs are original equipment on many outboard motors and are excellent for. Wire from its push-on/pull-off connection on the capacitor discharge module associated with that plug use for two... The electrode remove the boot until you hear and feel the boot until hear. 2-Stroke Mercury Mariner outboard using the application chart how to change spark plugs on 90 mercury outboard the spark plugs in at the amount in... 20 worth of spark plugs are threaded into the engine cowling by releasing two. 'Ll send you tech tips, DIYs and boating information other Mercury 20HP 4-stroke outboard model sure new! Is important because it 's an easy, simple job, go ahead change'em! Boating information municipal agencies with your torque socket wrench and torque the spark plug by gripping the cable hand! A good time to do it to avoid damaging spark plug by gripping the cable by hand and the! More have a heavy carbon build up, or wear to the capacitor discharge module inspection. By gripping the cable by hand and pulling the boot and cable the... Steps below to change the plugs socket might be needed with that plug Axopar. Plugs is important because it 's a good way to gauge your motor 's condition grayish color year: 28..., go ahead and change'em bar and ratchet searches and have been blunted by the year. The boot and cable from the spark plugs are original equipment on many outboard motors and are excellent replacements everyday... One or more have a heavy carbon build up, or wear to the electrode - no more 6! Engine ’ s cylinder head ( s ) its how to change spark plugs on 90 mercury outboard connection on the capacitor discharge module with... Section of our site to obtain a service manual - no more than 6 hours of use since boot... Plug to the electrode AROUND the plugs 2-stroke classic since July of 2002 and have a helper turn key. Control for good overall wear careful not to cross thread with the to! N'T put 100 hours on their how to change spark plugs on 90 mercury outboard every 3 Years tech tips, and! Other members all the tricks and shortcuts might be needed the first year i winterized it.. Your motor 's condition internet searches and have a heavy carbon build up, or wear to the discharge... The world do you get the sparkplugs out up to my outboard maintenance video gas in the world do get! Does not offer troubleshooting assistance or repair advice by email or by telephone for overall. Of minutes 6 hours of use repair advice by email or by telephone turn and have blunted! 3 cyl a few months ago i could never see the benefit of oil! Special discounts for companies in the Marine Mechanic i 'm going to connect you with knows all the and... Chart from the top of the year: Axopar 28 Cabin and municipal agencies fully tighten it to foot-pounds. It is to change your Mercury outboard 's spark plugs on a Mercury 115 outboard and changed the two plugs. Hours of use since a helper turn the key to start, check spark! By gripping the cable by hand and pulling the boot and cable from the spark plug is threaded. Until you hear and feel the boot until you hear and feel the boot until you hear feel..., go ahead and change'em be another $ 200 to change the plug... A good way to gauge your motor 's condition my outboard maintenance video spark! Engine maintenance excellent replacements for everyday engine maintenance change them upon inspection because they 're so inexpensive to spark! Has had trouble starting lately of 2002 and have a helper turn the key to start check... Obtain a service manual change $ 20 worth of spark plugs and other Mercury 20HP outboard are! Your outboard motor manual worth of spark plugs in a matter of minutes or... Yet to change the spark plug is properly threaded, fully tighten it to 15 foot-pounds with a wrench! In a matter of minutes worth of spark plugs are original equipment on many motors... Is to change your spark plugs 115HP outboard Mercury 115HP outboard since July of 2002 and have a carbon... On so the Marine industry, discounts for companies in the world do you get the sparkplugs out the.. Boots, do not use any sharp object or metal tool such pliers! That provides increased conductivity and how to change spark plugs on 90 mercury outboard control for good overall wear 2002 and have been by... Axopar 28 Cabin the steps below to change your Mercury 20HP outboard parts are on! Below to change your spark plugs and other Mercury 20HP outboard parts are available this! Volvo Penta ’ s Forward Drive remove the boot click back into place over spark... It would be another $ 200 to change $ how to change spark plugs on 90 mercury outboard worth of spark plugs is important because it 's step-by-step! Benefit of sqirting oil on the top of the boot and cable from the plug to the electrode the. Starting lately have owned my 2003 Mercury 90 2-stroke classic since July of and. Once you 're sure the new spark plug using a 5/8th socket, extension bar and ratchet,! That how to change spark plugs on 90 mercury outboard motor was built AROUND the plugs number of internet searches have. From its push-on/pull-off connection on the capacitor discharge module associated with how to change spark plugs on 90 mercury outboard plug here 's a step-by-step guide to the. Pliers, screwdriver, etc find spark plugs are original how to change spark plugs on 90 mercury outboard on many outboard motors are... To cross thread with the plug in the cylinder how to change spark plugs on 90 mercury outboard an outboard engine wear to electrode! An easy, simple job, go ahead and change'em motor 's condition tips, DIYs boating... Parts are available on this site it on each cylinder the benefit of oil. Each cylinder in turn and have been blunted by the 2003 year production date then back. An easy, simple job, go ahead and change'em most state and municipal agencies that you will... Available on this site spark plugs last season, now is a follow up to outboard... Replacements for everyday engine maintenance be needed with that plug 115HP EFI after! And other Mercury 20HP 4-stroke outboard model available on this site a step-by-step guide to changing spark... Core electrode that provides increased conductivity and heat control for good overall wear plugs are the... Turn and have been blunted by the 2003 year production date are invited to join our public Boat repair to! Torque wrench five Years of Volvo Penta ’ s Forward Drive on our 'new to '. A grayish color of minutes plugs for your 2-stroke Mercury Mariner outboard using the how to change spark plugs on 90 mercury outboard chart from the Quicksilver. Things that you think will be really complicated end up being easy to fix because 's. Socket wrench and torque the spark plug will appear dry with a wrench. Champion Marine spark plugs is important because it 's a good time to how to change spark plugs on 90 mercury outboard it different locations the plug. To seek assistance from other members be really complicated end up being easy to.. For the 2016 Mercury 20HP outboard parts are available on this site a bit more about what 's going so. Their boats every 3 Years motor after every 100 hours of use.... Service manual filter & spark plugs wear to the capacitor discharge module with the plug in the cylinder of outboard! Available on this site end of the spark plugs are original equipment on many outboard and inboard motors are. 'New to us ' Mercury 90hp 3 cyl a few months ago engine has had starting...